Enduro

HDK-0011 Drop-In Headset Kit - IS42/28.6 Upper | IS52/40 Lower - 36x45 Tapered

The Enduro HDK-0011 Drop-In Headset Kit is a precision integrated headset solution for modern frames using IS42/28.6 (upper) and IS52/40 (lower) bearing seats with a 1-1/8" to 1-1/2" tapered steerer. Built around 36x45 angular contact bearings with properly matched chamfers, it delivers stable steering under braking and cornering loads while maintaining low friction for smooth, consistent handling. Premium bearing materials and an aggressive grease fill target long service life in wet, high-miles riding, making it a strong choice for riders who want durability without adding complexity or frequent headset maintenance.

• IS42/28.6 upper | IS52/40 lower - Correct fit for frames designed around integrated (drop-in) bearing seats
• 36x45 angular contact bearings - Designed to manage combined radial/axial loads for precise steering feel
• Chamfer-matched bearing interfaces - Promotes proper alignment and consistent contact under load
• 440C balls and races - High-grade stainless steel bearing material chosen for wear resistance and long-term smoothness
• 90% fill high-pressure waterproof grease - Helps resist water intrusion and extends service intervals in foul-weather riding
• Long-term bearing coverage - Bearings are backed by Enduro for as long as the bike is owned